I run VAG-Check on a Pocket PC. You need the following:
A Pocket PC with a serial port. Make sure the PDA has a serial port. You know it does if you can use a serial cable to connect it to the PC to run ActiveSync.
A serial connection cable, the kind to connect it to the computer to run ActiveSync. This is either provided (if an older model), or you can purchase it from the manufacturer or at a store. For iPaqs, you can purchase HP's serial cable connector (usually a
combo serial+USB cable).
A 9-pin serial port gender changer. Radio Shack.
A 9-pin serial null modem adapter. Radio Shack.
An OBD<->Serial interface. OBDTool sells one. An old ISO-COM VAG-COM interface probably works.
Connection is as follows:
OBD->gender changers->null modem adapter->serial cable->Pocket PC
VAG-Check can do blocks, basic settings, and read/clear DTCs. Pretty much anything involving the Engine Module is available, so it's a decent diagnostic tool to have around. If you want more features, VAG-COM is still the best. I have both. The PDA gets more work since I usually have the iPaq on my person at all times (I keep the cables in the car). But when the car is in the garage and I'm doing, say, readiness tests, VAG-COM remains the better tool. I'd prefer to use the iPaq, but I'll have to wait a bit for VAG-Check to catch up... or VAG-COM to port.